Extension-drill.



J. H. RUSBY.

EXTENSION DRILL.

APPLIOATION FILED SEPT. 1s, 1909.

Patented Apr. 14, 1914.

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JOSEPH H. RUSBY, OF NUTLEY, NEW JERSEY.

EXTENSION-DRILL.

Specification of Letters Patent. Application filed September 18, 1909.

Patented Apr. la, i914. Serial No. 518,308.

To all whom it may concern Be it known that I, JosnPi-I H. RUsBY, acitizen of the United States, residing at Nutley, in the county of Essexand State of New Jersey, have invented new and useful Improvements inExtension-Drills, of which the following is a specification.

This invention relates to a drill. The same can be driven by hand or bymotor or in any suitable way. The drill is made extensible to a greateror less extent as required for varying kinds of work.

This invention is set forth in the following specication and claim andillustrated in the annexed drawing in which;-

Figure l shows an elevation partly in section of a drill embodying thisinvention.

ig. 2 is a section along the line a: fr Fig. l.

ig. 3 is a sectional elevation of a modification. Fig. 4c is a sectionalong the line y y Fi 3.

Fn this drawing the letter a indicates a frame which can be of suitableperforated work if desired. A shaft Zi is rotatable in the frame. On theshaft is a rotating piece 0 having a gear connection UZ with shaft ecarrying crank arm f with handle or crank g by which rotation can becommunicated to the shaft.

The shaft b has a feather connection with the rotating piece so that theshaft and rotating piece will turn together but the shaft can beextended or set in or out as presently explained. In the rotating pieceis a latch /z normally engaging the shaft a by means o-f one or anotherof its stop depressions A spring normally holds the latch to the shaftbut said latch can be pressed to releasing position by a pressure on itsend which is formed as a thumb button.

When the latch is pressed clear uncoupling the shaft the latter can beset or slid one way or another. A holding handle is shown screwedthrough the wall of frame a and a breast plate m has a stem insertedinto the end of the tubular frame a. By screwing the handle 7c home toclamp or engage the stem or breast plate m the latter is held againstpulling out.

A chuck carried by the shaft enables a: tool or drill to be connected tothe shaft as required. An externally threaded rotatable adjusting piecen is placed about the shaft. A yoke piece 0 is threaded onto thistubular piece and by means of a chain or connecting means 29 loopedabout the work (not shown) the drill can be held to contact with thework as the operation of drilling progresses. By suitably rotating oradjusting the tubular piece a slack of the connection p can be taken upas required by the progress of the work, as the rotation of adjusting'piece n will set the yoke 0 to tighten the connection 29.

In the modication shown in Fig. 3 the speed of shaft can be varied. Twogears d are shown both of which are loose on the rotating piece c andone or the other gear can be coupled to turn with the rotating piece o.A coupling slide g can be set back and forth to couple one gear d or theother by lifting the latch r out of one pit and allowing it to snap intoanother pit of the rotating piece c. Antifriction balls s can besuitably applied to take up the thrust of shaft ZJ during operation. Asthe gear wheels (Z engage gears placed at different distances from thecenter of driving shaft e the speed communicated to shaft will bevaried.

As shown in the drawing the shaft o may be entirely withdrawn ordetached from the frame a and various shafts provided with differenttypes of chuck can be interchangeably employed.

It will be seen that by means of the feathered splineway the shaft willat all times rotate in unison with its driving pinion (Z, and thedepressions in the shaft will be maintained in line with the springlatch, so that when a depression z' is opposite the hook portion of thelatch the hook will automatically engage a depression and lock the shaftto the gear.

I claim In an extension drill, the combination with a frame, of a shaftrotatably and telescopically mounted in said frame and having alongitudinal series of :dined depres- In testimony whereof I havehereunto set sions, a driving gear mounted 1n the frame my hand 1n thepresence of tWo subscribing and a gear driven thereby sphned on sindWitnesses.

shaft, and a retractle spring Catch carried JOSEPH H. RUSBY. 5 by saiddriven gear and adapted to engage Witnesses:

any one of Said depressions to secure the W. C. HAUFF,

sha-ft n adjusted positions n said frame. CHRIS. OLMSTAEDT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

